I want to lower the tone. Reading about using conditioner on the inside of shoes made me think. I recently bought a pair of Dr Marten's boots. They are notoriously difficult to break in (although I haven't, particularly, noticed this]. A couple of days ago, taking a lead from this thread, I put some Renapur on the inside of the boots. The boots are not lined, so I was working on the inside part of the corrected grain. I now find they have quite a bit more 'give' in them and they are more comfortable - although I am aware that the placebo effect may be at work here. I used my fingers to put the Renapur on.
Renapur is made from Beeswax, Carnauba wax, Jojoba oil and Avocado oil, just in case you are wondering. Sincerely yours, Munky.